Miami, FL Accessory Structures: ADU Impact Fees (2026)

Florida authorizes local governments to impose impact fees on new development under FL Statute §163.31801 (the Florida Impact Fee Act). Miami-Dade County maintains an impact fee schedule under Miami-Dade Code Chapter 33E that applies to new construction within the County — including ADUs in incorporated Miami. Categories include Road Impact Fee, Educational Facilities Impact Fee (Miami-Dade Public Schools), Park Impact Fee, Police Impact Fee, and Fire/Rescue Impact Fee. Rates vary by Benefit District and dwelling type; ADU fees are typically charged at a reduced 'multi-family' or 'small accessory unit' rate, but applicants should verify with the Miami-Dade Impact Fee Office. The City of Miami also charges its own building permit and plan-review fees under City Code Chapter 10. FL §163.31801(6) caps annual impact fee increases to inflation-adjusted ranges (no more than 50% over a four-year period without a demonstrated-need study). Permit applicants should obtain a written impact-fee estimate before pulling the permit; the County issues a Tax Receipt for impact fees that must accompany the City building permit application.